package com.hmdp.utils;

import lombok.RequiredArgsConstructor;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * ClassName: RedisIDWorker
 * Package: com.hmdp.utils
 *
 * @Author: itheima-ht
 * @Create: 2025/4/11 14:18
 */
// 自定义全局唯一id生成器
@Component
@RequiredArgsConstructor
public class RedisIDWorker {

    // 2025年1月1日 0:0:0对应的秒数
    private static final long BEGIN_TIMESTAMP = 1735689600L;

    /**
     * 序列号的位数
     */
    private static final long COUNT_BITS = 32;

    private final StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix) {
        // 1.生成时间戳
        long nowSecond = LocalDateTime.now().toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        // 2.生成序列号
        // 2.1获取当前日期，精确到天
        String date = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 2.2自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        // 3.拼接并返回
        return timestamp << COUNT_BITS | count;
    }

    // public static void main(String[] args) {
    //     LocalDateTime time = LocalDateTime.of(2025, 1, 1, 0, 0, 0);
    //     long second = time.toEpochSecond(ZoneOffset.UTC);
    //     System.out.println(second);
    // }
}
